1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65877b26008f3f90562e6f953dd80f5a79b71d130d3eab7868c671a1d9f7c0c5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b6b8f1b7-7246-433e-ae51-3682f4714d86.json and https://artists.proofprofile.net/proofs/artist/b6b8f1b7-7246-433e-ae51-3682f4714d86.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029dacbaac9c9e733b6a63bbdf9c454f317fa25e921b38dbb3cd6b538a2206f2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DK7U22200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb934b6399c5bf048a2a79d92f14eab36eb28ca0e32d50e3dfa3b3878fd6f9ece. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DK7U22200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59fe80fced5d5159a6977078d545bbd920e01a18bd904b7b9deeee3ef20b4616. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DK7U22200103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f86d94aaa23cd01040c59a7bf5963c88c1b1f7ec07cdcaf8eb92ef16b5e7d26. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DK7U22200104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f840445ac80d129a73fc2a6182733a4232bdb4e86151db1e25f1015355d6d07. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DK7U22200105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3684ef30166469c30416c80a297c8b742dde46ac6061e4b01a271966b1d0e9ee. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DK7U22200106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a69bcefb78897edf2c54bc8e3972eca7d073565d96e1f5eddf93ee7ccd40ca4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DK7U22200107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc29c76e5b0b893de163e3e4753c4aad64af6860d34e1f670ef01b648c432b54. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DK7U22200108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434c77c7757b36d5e9ec87a8568c22161d7ee6cdb33189af3b439f8473a87888. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DK7U22200109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4166cee0f56eddbfd02ff949e0b0ef60c589ea6572b898a6ea33d2e3b5ec8c51. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DK7U22200111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be77f23187bcdd61059fc57e2e2893dc710af85dce0e2f99ec7794ae70cb0bd. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BRNXH1800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c9ae54876e56e35a087fc7323d159b3818df47039412ab4177b0cdcab9a4aa. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BRTRB1994737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029dacbaac9c9e733b6a63bbdf9c454f317fa25e921b38dbb3cd6b538a2206f2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DK7U22200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d98a09f2006582036802693031683b1fd3a92813db4aed51072f75a518b5b2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELO20911908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f2a0fe652ff7569c7585e6c9763d60326d61f5b046ad926dc0bc29aed1095a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELO20911911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5e5c64be2279c995593846b3e511841789c36166e96f01aeff5b8306e5982a. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELO20911912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67eae498df13e8bcc9b23c5d421eb316f34f3807c89d18850a564266dfc31ba1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELO20911913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8482b2a49256798243c0ab57316a6fb0191d963102e5d5dd50a6ac3e71e918. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELO20911914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb234d915c5c377ed413f3e5f90be15432fd7c57065c9fcd86d26fd0fd6b8014. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELO20911910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055dc01fe52da6c2e68c9490bed74dd381c54bb22bce821cdddf5ed1b38dbadf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELO20911909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8a3fbfb6fe2c5836cb2093012234cacffe69f8d5098f99734900f4f3e1de7a. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELO20911915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4418c0d0e7986167aeb3bfc3573ccae324fce59fa8edaa806c5df589fbecf3ab. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BRKUA2000105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e45bcad5e6669a1b36cd2fc1b1df059e2d37b46c7ad95115656bd77ef5cf190. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BRKUA2000106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa36fa6f1843744083d7523fbaa9192a1eafbe73f0e1707390b7a9dbf44192dc. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BRKUA2000116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c5cee73869c0f00ab3e2e27ced49b4ad10815daf6f6a5583f700b689e48e4d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BRTRB1865021.